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fs/core/vmcore: Move sev_active() reference to x86 arch code

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Secure Encrypted Virtualization is an x86-specific feature, so it shouldn't
appear in generic kernel code because it forces non-x86 architectures to
define the sev_active() function, which doesn't make a lot of sense.

To solve this problem, add an x86 elfcorehdr_read() function to override
the generic weak implementation. To do that, it's necessary to make
read_from_oldmem() public so that it can be used outside of vmcore.c.

Also, remove the export for sev_active() since it's only used in files that
won't be built as modules.

Signed-off-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Lianbo Jiang <lijiang@redhat.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190806044919.10622-6-bauerman@linux.ibm.com
This commit is contained in:
Thiago Jung Bauermann
2019-08-06 01:49:18 -03:00
committed by Michael Ellerman
parent 284e21fab2
commit ae7eb82a92
5 changed files with 23 additions and 6 deletions
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1
arch/x86/mm/mem_encrypt.c
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@@ -349,7 +349,6 @@ bool sev_active(void)
{
return sme_me_mask && sev_enabled;
}
EXPORT_SYMBOL(sev_active);
/* Override for DMA direct allocation check - ARCH_HAS_FORCE_DMA_UNENCRYPTED */
bool force_dma_unencrypted(struct device *dev)